def test_other(self):
p = PersistentList()
p.insert(0, 2)
assert p == [2]
assert p.count(0) == 0
assert p.count(2) == 1
assert p.index(2) == 0
p.remove(2)
p.extend(PersistentList(interval(3)))
assert p == interval(3)
def other(self):
p = PersistentList()
p.insert(0, 2)
assert p == [2]
assert p.count(0) == 0
assert p.count(2) == 1
assert p.index(2) == 0
p.remove(2)
p.extend(PersistentList(interval(3)))
assert p == interval(3)
